/*取消鼠标双击选中*/
html , body{
  -moz-user-select:none;
  -ms-user-select: none;
  -webkit-user-select: none;
  user-select: none; 
}
/*清除浮动*/
.clearfix:before,
.clearfix:after {
  content: ' ';
  display: inline-block;
  height: 0;
  clear: both;
  visibility: hidden;
}
.clearfix {
  *zoom: 1;
}

/*隐藏*/
.dn {
  display: none;
}

/*左浮动*/
.left{
  float: left;
}

.right{
  float: right;
}
/*取消鼠标双击选中*/
html , body{
  -moz-user-select:none;
  -ms-user-select: none;
  -webkit-user-select: none;
  user-select: none;
}
/*清除浮动*/
.clearfix:before,
.clearfix:after {
  content: ' ';
  display: inline-block;
  height: 0;
  clear: both;
  visibility: hidden;
}
.clearfix {
  *zoom: 1;
}

/*隐藏*/
.dn {
  display: none;
}

/*左浮动*/
.left{
  float: left;
}

.right{
  float: right;
}